ABSTRACT
One of the most important aspects of gear design has been the estimation of dynamic loads on gear teeth and gear noise. Many researchers have studied the effects of nonlinear factors such as backlash and time-varying mesh stiffness of teeth on the dynamic response of gear-pair system. However, the relationship between dynamics and geometrical parameters of spur gear pair is not completely understood for the design of quiet gears. Using the finite element (FE) method, this study examined the effects of geometrical gear tooth features such as tooth addendum, gear backlash, and linear tip-relief tooth profile alteration on the vibration behavior of a pair of spur gears. For this purpose, test gear pairs were designed and developed for investigation. Dynamic response of spur gear pairs in root-mean-square (RMS) acceleration was measured using accelerometer along vertical direction on the bearing block of the output shaft. Three factors selected with their levels in the present study are, viz. tooth addendum as 3.3 mm, backlash in the range of 0.150–0.175 mm, and linear tip-relief tooth profile modification (long relief). It can be concluded from the FE analysis that when comparing gear backlash and tooth addendum, the linear tip-relief tooth profile modification is the factor that has the greatest influence. Finally, the results obtained from the FE analysis are validated by comparing with the experimental results.
